JPS63309379A - Device for removing spatter of arc welding torch - Google Patents

Abstract

PURPOSE:To improve the spatter removing efficiency on the tips of a nozzle and a feeding chip by arranging double electromagnetic induction coils in the vicinity of the torch main body tip and applying reverse current to the outside and inside coils at the same time. CONSTITUTION:An electromagnetic induction coil unit 6 consisting of the outside coil 7 and the inside coil 8 is arranged to the lower part of a nozzle main body 2 provided with the nozzle 3 on the tip. At this time, the coil unit 6 is arranged so that the tip of the nozzle 3 faces on the middle between the inside and outside coils 8 and 7 and the tip of the feeding chip 4 faces on the inside periphery of the inside coil 8. When the reverse DC currents are applied from a current supply source 12 to the coils 7 and 8, magnetic lines of force of the coils 7 and 8 change the intense magnetic flux in the vicinities of nozzle spatters 18 and chip spatters respectively and attract and remove the spatters strongly. By this method, the removing efficiency of the spatters 18 and 19 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an arc welding torch spatter removal device for removing spatter deposited on the tip of a nozzle or power supply tip.

(Prior art) When melting a welded part in arc welding, molten metal particles (spatter) are scattered from the molten part, and this spatter adheres to the tip of the tip of the nozzle and feeder 7, and if left alone, The deposition of the spatter gradually blocks the exit of the shielding gas and causes problems in subsequent welding operations, so it is necessary to remove the spatter from time to time.

Therefore, the inventor of the present invention proposed a method for removing the spatter by disposing an electromagnetic induction coil around the tip of the torch body and instantly passing a large current through the coil.
We have developed a device that applies electromagnetic force to the sputter toward the center of the torch and causes it to separate from the tip of the nozzle or power supply tip, and the applicant has already filed a patent application for this invention (Japanese Patent Application No. 60-295454). - According to this method, spatter can be removed in a non-contact manner without applying any external force to the nozzle, so the nozzle will not be damaged or damaged, and manual work is not required. Excellent results were obtained, such as increased safety and improved operating efficiency of the equipment.

(Problems to be Solved by the Invention) However, in the device used in this method, a large-capacity power source is required in order to obtain sufficient suction force from the coil to remove spatter, and in addition, As a gap problem, even if spatter at the tip of the nozzle can be removed, it is difficult to remove spatter from the power supply nozzle, and in these respects it cannot be said to be sufficient.

The present invention has been made in view of these points, and an object thereof is to provide a spatter removal device for an arc welding torch that improves spatter removal performance.

(Means for Solving the Problems) Therefore, the device of the present invention includes a double-structured electromagnetic induction coil unit 6 consisting of an outer coil 7 and an inner coil 8, and this coil unit 6 has an arc welding torch 1
The tip of the nozzle 3 faces between the outer coil 7 and the inner coil 8, and the tip of the power supply chimp 4 faces the inner periphery of the inner pulley 8. 1 for this coil unit 6! flow source 1
2 are connected to form a coil unit.

(Function) With this configuration, the outer coil 7 and the inner coil 8 have 1 power at the same time! When the flow is applied and both coils 7 and 8 are excited, the lines of magnetic force toward the tip of the nozzle 3 are the outer coil 7 and the inner coil 8.
As a result, the magnetic flux density changes near the tip of the nozzle 3 in a similar manner, and the lines of magnetic force that bend toward the inner circumference of the inner coil 8 are concentrated near the tip of the power feeding tip 4. Since the tip bends sharply, the magnetic flux density changes rapidly near the tip of the power feeding tip 4 as well. Therefore, the suction force against the spatter 18° 19 attached to both the tip of the nozzle 3 and the tip of the power supply tip 4 is strengthened.
(Example) Examples of the present invention will be described below with reference to the drawings.

Fig. 1 is an explanatory diagram showing the configuration of an embodiment of the spatter removal device according to the present invention, Fig. 2 is an explanatory diagram of its operation, and Fig. 3 has only one coil 4 disposed around the tip of the torch body. FIG. 3 is an explanatory diagram of the operation of the spatter removal device.

First, in Fig. 1, 1 is an arc welding torch, and 2
3 is the torch body, 3 is a ceramic nozzle screwed onto the tip of the torch body 2, 4 is a power supply tip at the tip of a hollow tip body placed inside the torch body 2 and nozzle 3, and 5 is a power supply tip. The welding wire is a welding wire that penetrates the center of the torch body 2 and can be led out from the tip of the power supply balance 4, and the shielding gas is supplied to the hollow part 5 of the torch body 2 from an inlet (not shown) provided in the torch body 2, and the nozzle 3 and the power supply chip 4.

An electromagnetic induction coil unit 6 is located near the tip of the torch body 2.
is installed. This coil unit 6 is composed of an outer coil 7 and an inner coil 8, and as shown in FIG. faces the inner periphery of the inner coil 8.

The outer coil 7 is formed by a conducting wire 9 wound three times in a bobbin 10, and the inner coil 8 is formed by a conducting wire 9 wound twice in a bobbin 11. The inner diameter of the outer coil 7 is close to the outer diameter of the tip of the nozzle 3.

12 is a current supply source, and this current supply source 12 includes an AC power source 13, a rectifier circuit 14 that rectifies the AC from the AC power source 13, and a capacitor 15 that charges the DC output from the rectifier circuit 14. including. This capacitor 15 and rectifier 1
A switch 16 is connected to the circuit 14, and a switch 2-17 is connected to the output side of the capacitor 15. First,
The switch 17 is opened and only the switch 16 is closed to charge the capacitor 15, and then the switch 17 is closed and the capacitor 15 is discharged so that a large current is output. Each output end of this current supply source 12 is connected to the connection ends 9A and 9B of the conductor 9, and a large current is simultaneously passed through the outer and inner coils 7.8, and the directions are opposite to each other as shown in FIG. It is designed to face the direction.

Next, the operation will be explained with reference to FIGS. 2 and 3. In these figures, 18 is nozzle spatter adhering to the tip of the nozzle 3, 19 is the feed TM, chip spatter adhering to the tip of the f-tube 4, and the broken lines indicate lines of magnetic force.

First, in FIG. 3, in the case of a device having one coil 20, the magnetic lines of force of that coil 20 spread over the entire inner circumference of the coil 20, including areas unrelated to spatter removal.
Since the magnetic flux density in the nozzle spatter 18 is low and the change in magnetic flux density is small in the axial direction, the attraction force is small, and this tendency is even greater in the chip spatter 19.

In the case of the apparatus of this embodiment, the magnetic lines of force from the coils 7 and 8 are concentrated between the coils 7 and 8 facing the nozzle sputter 18, and a part of them is bent toward the inner circumference of the coil 8, so that the magnetic flux density changes. The suction force against the violent Shinozzle spatter 18 increases. Furthermore, since the lines of magnetic force directed toward the inner periphery of the inner coil 8 sharply bend near the chip sputter 19, the attractive force toward the chip sputter 19, where the magnetic flux density changes drastically, also increases.

In this way, the suction force can be concentrated at the location where the nozzle spatter 18 and the chip batter 19 are present.

(Effects of the Invention) As is clear from the above, according to the present invention, concentrating the suction force on the location where the spatter is attached is -c' kill o, and the spatter removal performance can be improved. This method eliminates the need for a conventional large-capacity power supply9, which strengthens the suction power, and also makes it possible to reliably remove not only spatter at the tip of the nozzle, but also spatter at the tip of the power supply tip. Become.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the configuration of an embodiment of the spatter removal device according to the present invention, Fig. 2 is an explanatory diagram of its operation, and Fig. 3 has only one coil disposed around the tip of the torch body. FIG. 3 is an explanatory diagram of the operation of the spatter removal device. 1... Arc welding torch 2... Torch body 3... Ceramic nozzle 4... Power supply tip 6... Electromagnetic induction coil unit 7...
Outer coil 8... Inner coil 12... Current supply source

Claims (1)

[Claims] (1) A double-structured electromagnetic induction coil unit consisting of an outer coil and an inner coil, the coil unit having a nozzle tip of an arc welding torch facing between the outer coil and the inner coil, is arranged near the tip of the torch main body of the arc welding torch so that the tip of the power supply tip faces the inner periphery of the inner coil, and a current supply source is connected to the coil unit, and the coil unit and the current supply source are connected to each other. A spatter removal device for an arc welding torch, characterized in that a current circuit is formed in which currents in opposite directions flow simultaneously through the outer coil and the inner coil.